Which of these proteins make up the thin filament of the sarcomere?
a) actin, myosin, troponin
b) myosin, tropomyosin, troponin
c) actin, troponin, tropomyosin

The correct answer is option C- actin, troponin, tropomyosin.

Explanation:

The sarcomere is a functional contractile unit of striated muscle made up of thick (myosin) and thin (actin) filaments. These fibrous filaments are present between the two Z-lines which slide past each other causing lengthening and shortening when the muscle relaxes or contracts.

The thin filament or actin myofilament is composed of fibrous actin (F actin) and troponin and tropomyosin molecules where tropomyosin hide and expose active sites of G- actin whereas troponin helps bind F-actin to tropomyosin.

Thus, option c is the correct answer.

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